ui/gfx/canvas_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <limits>
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "testing/gtest/include/gtest/gtest.h"
   9 #include "ui/gfx/canvas.h"
  10 #include "ui/gfx/font.h"
  11
  12 namespace gfx {
  13
  14 class CanvasTest : public testing::Test {
  15  protected:
  16   int GetStringWidth(const char *text) {
  17     return Canvas::GetStringWidth(UTF8ToUTF16(text), font_);
  18   }
  19
  20   gfx::Size SizeStringInt(const char *text, int width, int line_height) {
  21     base::string16 text16 = UTF8ToUTF16(text);
  22     int height = 0;
  23     int flags =
  24       (text16.find('\n') != base::string16::npos) ? Canvas::MULTI_LINE : 0;
  25     Canvas::SizeStringInt(text16, font_, &width, &height, line_height, flags);
  26     return gfx::Size(width, height);
  27   }
  28
  29  private:
  30   gfx::Font font_;
  31 };
  32
  33 TEST_F(CanvasTest, StringWidth) {
  34   EXPECT_GT(GetStringWidth("Test"), 0);
  35 }
  36
  37 TEST_F(CanvasTest, StringWidthEmptyString) {
  38   EXPECT_EQ(0, GetStringWidth(""));
  39 }
  40
  41 TEST_F(CanvasTest, StringSizeEmptyString) {
  42   gfx::Size size = SizeStringInt("", 0, 0);
  43   EXPECT_EQ(0, size.width());
  44   EXPECT_GT(size.height(), 0);
  45 }
  46
  47 // Line height is only supported on Skia.
  48 #if defined(OS_MACOSX) || defined(OS_ANDROID)
  49 #define MAYBE_StringSizeWithLineHeight DISABLED_StringSizeWithLineHeight
  50 #else
  51 #define MAYBE_StringSizeWithLineHeight StringSizeWithLineHeight
  52 #endif
  53
  54 TEST_F(CanvasTest, MAYBE_StringSizeWithLineHeight) {
  55   gfx::Size one_line_size = SizeStringInt("Q", 0, 0);
  56   gfx::Size four_line_size = SizeStringInt("Q\nQ\nQ\nQ", 1000000, 1000);
  57   EXPECT_EQ(one_line_size.width(), four_line_size.width());
  58   EXPECT_EQ(3 * 1000 + one_line_size.height(), four_line_size.height());
  59 }
  60
  61 }  // namespace gfx